Use-After-Free Vulnerability in Linux Kernel PCI/ASPM Management

CVE-2023-53446

What is CVE-2023-53446?

A use-after-free vulnerability was identified within the Linux kernel's handling of PCI/ASPM. The issue arises when the 'downstream' pointer in the struct pcie_link_state remains retained after the removal of a multifunction device function, leading to potential dereferencing of a freed memory block. This could cause unexpected behavior and crashes, compromising system stability. To mitigate the issue, the kernel disables ASPM and properly frees the pcie_link_state when a child function is removed, preventing the dangling pointer scenario and ensuring consistent ASPM Control configurations across multifunction devices.

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